import java.util.Scanner;

public class Main1817 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] arr = new int[n];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = sc.nextInt();
        }
        for (int i = 0; i < n; i++) {
            if (n % 2 == 0) {
                if (arr[i] == arr[n - 1 - i]) {
                    System.out.println("YES");
                    break;
                } else {
                    System.out.println("NO");
                    break;
                }
            } else {
                if (arr[i] == arr[n - 1 - i]) {
                    System.out.println("YES");
                    break;
                } else {
                    System.out.println("NO");
                    break;
                }
            }
        }
    }
}
